EP0411600B1 - Direction assistée - Google Patents

Direction assistée Download PDF

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Publication number
EP0411600B1
EP0411600B1 EP90114746A EP90114746A EP0411600B1 EP 0411600 B1 EP0411600 B1 EP 0411600B1 EP 90114746 A EP90114746 A EP 90114746A EP 90114746 A EP90114746 A EP 90114746A EP 0411600 B1 EP0411600 B1 EP 0411600B1
Authority
EP
European Patent Office
Prior art keywords
transmission shaft
steering apparatus
power steering
set forth
reduction unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90114746A
Other languages
German (de)
English (en)
Other versions
EP0411600A1 (fr
Inventor
Yasuhiro C/O Koyo Seiko Co. Ltd. Nakamura
Akira C/O Koyo Seiko Co. Ltd. Chikamori
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koyo Seiko Co Ltd
Original Assignee
Koyo Seiko Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP1989134220U external-priority patent/JPH0716134Y2/ja
Priority claimed from JP7798690A external-priority patent/JP2816408B2/ja
Application filed by Koyo Seiko Co Ltd filed Critical Koyo Seiko Co Ltd
Publication of EP0411600A1 publication Critical patent/EP0411600A1/fr
Application granted granted Critical
Publication of EP0411600B1 publication Critical patent/EP0411600B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0403—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/043—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by clutch means between driving element, e.g. motor, and driven element, e.g. steering column or steering gear
    • B62D5/0433—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by clutch means between driving element, e.g. motor, and driven element, e.g. steering column or steering gear the clutch being of on-off type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2186—Gear casings

Definitions

  • This invention relates to a power steering apparatus having an electric motor as a source to generate a steering assisting power and, in particular, to a power steering apparatus provided with an electromagnetic clutch in a power transmission system extending from the electric motor to a steering mechanism.
  • JP-A-1-309 876 describes a power steering apparatus employing an electric motor as a source to generate a steering assisting power.
  • the apparatus is intended to reduce the burden of labor required for operating a steering wheel by assisting the performance of a steering mechanism with the rotative power of a steering assisting electric motor disposed in the steering mechanism and driven on the basis of results of detecting steering torque.
  • the power steering apparatus as compared with a hydraulic power steering apparatus employing a hydraulic actuator as a source to generate a steering assisting power, has an advantage that appropriate characteristics corresponding to vehicle speed, frequency of steering operation, and running condition can be exhibited because the characteristics can be easily changed with the rotation control of the electric motor.
  • this apparatus is followed by such a problem as difficulty in obtaining an electric motor of small size which is capable of generating sufficient rotative power for assisting steering.
  • inertia of the rotating parts of the electric motor influences the steering operation.
  • such means as disposing an appropriate speed reduction unit between an output shaft of the electric motor and a transmission shaft connected to the steering mechanism has hitherto been employed so as to solve the abovesaid first problem by the power increasing action of the speed reduction unit.
  • an electromagnetic clutch is arranged between the output shaft of the electric motor and the transmission shaft connected to the steering mechanism so that both shafts may be engaged with each other, only when required, by the action of the electromagnetic clutch.
  • the electromagnetic clutch is provided with friction plates respectively rotating in accordance with the output shaft and transmission shaft, a driving coil fixedly disposed on the back of the friction plate on the side of the output shaft, and an armature part disposed on the back of the friction plate on the side of the transmission shaft.
  • the action of the armature part following excitation of the driving coil presses both friction plates to each other and also engages both shafts with each other, and, on the other hand, the action of the armature part following de-excitation of the driving coil releases mutual pressing of friction plates and disengages both shafts from each other.
  • an output shaft on which a friction plate on one side and a retainer therefor are coaxially fitted and a transmission shaft on which an armature part formed integral with a friction plate on the other side is coaxially fitted are separately supported on the same shaft, and respective supported ends of both shafts are disposed oppositely to each other at an appropriate distance.
  • a planetary gear reduction unit or planetary roller reduction unit which can coaxially be composed of the output shaft of the motor and transmission shaft connected to the steering mechanism and is easily reduced in size, is used and disposed on one side of the electromagnetic clutch side by side.
  • An object of this invention is to provide a power steering apparatus capable of surely forming a fixed initial gap between both friction plates of the electromagnetic clutch.
  • Another object of this invention is to provide a power steering apparatus capable of eliminating troublesomeness in working and assembling the electromagnetic clutch.
  • Further object of this invention is to provide a power steering apparatus capable of removing insufficient action of the electromagnetic clutch resulting from sticking of lubricant thereto while preventing scatter of lubricant from the reduction unit to the electromagnetic clutch.
  • the power steering apparatus is defined by claim 1.
  • the intermediate transmission shaft prevents the armature part from tilting and is pressed to the side of the output shaft by biasing means so as to restrict the axial displacement occurred between the output shaft and the intermediate transmission shaft as well as the armature part supported thereby, whereby an initial gap roughly uniform in the circumferential direction is formed as fixed between both friction plates respectively fixed to the output shaft and armature part.
  • the power steering apparatus of this invention is also provided with a reduction unit composed on the intermediate transmission shaft and a shielding member disposed between the reduction unit and electromagnetic clutch for shielding the latter from the former. Lubricant scattering from the reduction unit is surely prevented from reaching the electromagnetic clutch by the shielding member so that insufficient performance of the electromagnetic clutch resulting from sticking of lubricant may be prevented.
  • the reference numerals 1 and 2 indicate an upper shaft and a lower one, respectively. Both shafts 1 and 2 are coaxially connected to each other through a torsion bar 3 and rotatably supported in a common cylindrical housing 4. The upper end of the upper shaft 1 is connected to a steering wheel not shown. A pinion 2a formed on the outer periphery near the lower end of the lower shaft 2 is meshed with a rack shaft 5 intersecting the pinion. In this way, a rack-pinion type steering mechanism is so constructed as to perform steering corresponding to the slide of the rack shaft 5 in the axial direction thereof.
  • the upper shaft 1 When operating torque is exerted on the steering wheel, the upper shaft 1 tends to rotate correspondingly there to whereas the rotation of the lower shaft 2 is restricted by resistance acting on the steering mechanism, whereby torsion corresponding to the amount and direction of the operating torque is generated in the torsion bar 3 and relative angular displacement corresponding to this torsion develops at the connecting part between the upper and lower shafts 1 and 2.
  • the reference numeral 6 indicates a torque sensor constructed at the connecting part between the upper and lower shafts for detecting operating torque acting on the steering wheel in terms of relative angular displacement.
  • a large bevel gear 7a is fitted on the middle outer periphery of the lower shaft 2 with toothed face thereof directed upward.
  • the housing 4 is provided with an outwardly extending cylindrical fixed housing 40.
  • An assisting-power generating part 10 concentrically with an electric motor 11 as a steering assisting power generating source, an electromagnetic clutch 12 for turning on and off the output of the motor 11, and a planet wheel reduction unit 13 for increasing output of the motor 11 is fitted into the open end of the fixed housing 40.
  • a transmission shaft 14 as an output shaft of the assisting-power generating part 10 is provided to extend to the inside of the housing 4 after passing through the fixed housing 40.
  • a small bevel gear 7b fitted on the extended end of the transmission shaft 14 is meshed with the large bevel gear 7a.
  • Output of the motor 11 is taken out to the transmission shaft 14 through the electromagnetic clutch 12 and planet gear reduction unit 13, transmitted to the lower shaft 2 through the small bevel gear 7b and large one 7a, and then converted into sliding in the axial direction of the rack shaft 5 upon meshing of the pinion 2a with the rack shaft 5, thereby steering being performed.
  • the motor 11 is driven on the basis of detection result of steering torque by means of the torque sensor 6 and adapted to generate the force corresponding to steering torque in the direction of steering torque exerted on the steering wheel. Output of the motor 11, as described above, is transmitted to the rack shaft 5 and adds to the force required for operating the steering wheel.
  • a thin shallow-cup-like shielding member 8 is mounted as shown in the drawing in such manner as separating the meshing part of the bevel gears 7a and 7b from the torque sensor 6.
  • the shielding member 8 functions to prevent a scatter of lubricant grease filled in the meshing part of the bevel gears 7a and 7b so as to maintain satisfactory lubricating condition thereat and also to intercept ingress of grease into the composing parts of the torque sensor 6 so as to prevent errors in detection of steering torque caused by sticking of grease.
  • the power steering apparatus of this invention is characterized by an internal structure of the assisting-power generating part 10.
  • Fig. 2 is an enlarged sectional view of the assisting-power generating part 10 of the first embodiment.
  • the numeral 10a represents a housing enclosing the whole of the assisting-power generating part 10.
  • An output shaft 11a of the steering assisting motor 11 and a transmission shaft 14 connected to the steering mechanism are coaxially supported in such manner that respective ends of both shafts are spaced from each other at a certain fixed distance in the axial direction.
  • a transmission system from the output shaft 11a to the transmission shaft 14 is composed of an electromagnetic clutch 12 provided on the side of the motor 11 (right side on the drawing) and a planet gear reduction unit 13 on the side of the transmission shaft 14 (left side on the drawing).
  • a thick disk-like retainer 20 composing a part of the electromagnetic clutch 12 is connected with a spline.
  • a thick disk-like carrier 30 composing a part of the planetary gear reduction unit 13 is connected with a spline.
  • the retainer 20 and carrier 30 are each provided with a round hole of a certain fixed depth at positions of axial centers on the sides opposite to each other.
  • a ball bearing 20a is fixedly fitted into the round hole of the retainer 20 and another ball bearing 30a is fitted into the round hole of the carrier 30 slidably in the axial direction.
  • An intermediate transmission shaft 15 featuring this invention is supported by ball bearings 20a, 30a at both ends between the output shaft 11a and transmission shaft 14.
  • a wave washer 16 as biasing means is mounted while adapted to be in contact with the end face of the transmission shaft 14 facing the inside of the round hole and with the outer ring of the ball bearing 30a.
  • the intermediate transmission shaft 15 is biased toward the side of the output shaft 11a by the wave washer 16 through the ball bearing 30a.
  • a sun gear 31 of the planet gear reduction unit 13 is formed on the outer periphery of the intermediate transmission shaft 15 on the side of the transmission shaft 14.
  • An armature part 22 of the electromagnetic clutch 12 is fitted on the outer periphery of the transmission shaft 15 on the side of the output shaft 11a.
  • the armature part 22 is provided with a cylindrical boss 22a fitted onto the intermediate transmission shaft 15, a movable thin plate 22b fixed to the boss 22a at one end and extending outwardly in the radial direction, and a friction plate 22c fixed to the movable plate 22b at the side of the output shaft 11a.
  • the boss 22a is retained by the shoulder face of a part composing the sun gear 31 and the inner ring of the ball bearing 20a at both ends respectively.
  • the boss 22a is pressed to the inner ring surface of the ball bearing 20a by biasing force of the wave washer 16 acting through the part thereof in contact with the shoulder part.
  • a driving coil 21 is fixedly fitted into the housing 10a at a position approximately agreeing with the tip of the output shaft 11a of the motor 11 in the axial direction.
  • the driving coil 21 is disposed in a recess formed throughout the peripheral surface of the retainer 20 on the side of the motor 11 and spaced from the bottom of the recess with a minute gap therebetween.
  • a friction plate 20c is fixed to the other face of the retainer 20.
  • the friction plate 20c is adapted to agree with the friction plate 22c of the armature part 22 in the radial direction and opposite to the friction plate 22c at a fixed distance in the axial direction.
  • the electromagnetic clutch 12 comprises a retainer 20 composed as above, a driving coil 21, and an armature part 22.
  • the driving coil 21 is out of excitation, only the retainer 20 rotates in association with the output shaft 11a.
  • the friction plate 22c of the armature part 22 and the movable plate 22b are attracted to the side of the retainer 20 by the action of a magnetic field induced in the vicinity of the armature part 22 through the retainer 20 and are brought into slide contact with each other, whereby output of the output shaft 11a is transmitted to the intermediate transmission shaft 15 through the retainer 20 and armature part 22.
  • the planet gear reduction unit 13 is provided with a sun gear 31 formed on the outer periphery of the intermediate transmission shaft 15, a ring gear 33 fixedly fitted into the housing 10a through a stationary ring 10b internally lined with rubber material and having a toothed face at inner side, and a plurality of planetary gears 32, 32, ... supported by the carrier 30.
  • the sun gear 31 and ring gear 33 are approximately agreeing with each other in the axial direction.
  • the planetary gears 32, 32, ... are meshed with the sun gear 31 and ring gear 33 respectively in the annular space formed between these two gears.
  • the planetary gears 32, 32, ... rotate together with the carrier 30 rotating in association with the transmission shaft 14 and revolve around respective pivotal shafts extending in parallel with the rotating shaft.
  • the planetary gear reduction unit 13 is fitted with grease to be used for lubrication at the meshing part between the sun gear 31, as well as the ring gear 33, and planetary gears 32, 32 ... . Scatter of grease upon the side of the electromagnetic clutch 12 and sticking to the slide contact surface of the friction plates 20c, 22c hamper the engaging action of the electromagnetic clutch 12.
  • a shielding member 9 is provided between the planetary gear reduction unit 13 and the electromagnetic clutch 12.
  • the shielding member 9 shown in Fig. 2 is a thin plate-like member fixedly interposed between one end surface of the stationary ring 10b and the inner shoulder face of the housing 10a. The inner peripheral edge of the shielding member 9 is opposite to the outer periphery of the boss 22a, which is fitted on the intermediate transmission shaft 15, with a slight gap left therebetween.
  • the intermediate transmission shaft 15 supporting the armature part 22 is biased toward the side of the output shaft 11a by the biasing force of the wave washer 16, and the armature part 22 and friction plate 22c thereof are positioned with respect to the retainer 20 and friction plate 20c fixed thereto while clamped at both ends of boss 22a thereof between the shoulder of the abovesaid sun gear-formed part 31 of the intermediate transmission shaft 15 and the inner ring of the ball bearing 20a. Accordingly, the size of the initial gap can easily be made proper by improving the precision in finishing the retainer 20 and armature part 22 without adjusting operation at the time of assembling. That is, in the steering apparatus of this invention, intricate adjusting operation for the initial gap between the friction plates 20a, 22a is needless in assembling the electromagnetic clutch 12, thereby assuring exact engagement and disengagement.
  • the shielding member 9 is provided between the planetary gear reduction unit 13 and the electromagnetic clutch 12 and, thus, the composing part of the planetary gear reduction unit 13 and that of the electromagnetic clutch 12 are almost completely shielded from each other by the shielding member 9, except a small portion necessary for piercing of the intermediate transmission shaft 15. Therefore, grease in the planetary gear reduction unit 13 is completely prevented from scattering by the shielding member 9 and insufficient engaging action of the electromagnetic clutch 12 caused by scatter of grease is prevented beforehand.
  • the installation of the shielding member 9 mitigates the shortage of grease developing with the lapse of time and scattering in the planetary gear reduction unit 13 and exhibits such additional effect as assuring normal transmission performance of the planetary gear reduction unit 13 for a long term.
  • Fig. 3 is an enlarged sectional view of an assisting-power generating part 10 as the second embodiment of this invention.
  • the assisting-power generating part 10 shown in this drawing is provided with a planetary roller reduction unit 17 in place of the planetary gear reduction unit 13 as in Fig. 2.
  • the planetary roller reduction unit 17 is in such structure that a plurality of planetary rollers 52, 52, ... are arranged between a sun shaft 51 formed of a diametrally enlarged mid-portion of the intermediate transmission shaft 15 and a stationary ring 53 fixedly fitted into the housing 10a, the planetary rollers being in rolling contact with the sun shaft, and these planetary rollers are rotatably supported by the carrier 30 connected to the end of the transmission shaft 14 with a spline.
  • Output of the motor 11 taken out to the intermediate transmission shaft upon interlock of the electromagnetic clutch 12 is transmitted to the planetary rollers 52, 52, ... through the sun shaft 51 formed on the midway of the transmission shaft 15, and is further transmitted to a shaft around which these rollers revolves, that is, the transmission shaft 14 while followed by slowdown of speed.
  • the stationary ring 53 is fixed in the housing 10a while clamped at both ends by annular disk-like spacer plates 54, 55. Respective inner peripheries of the spacer plates 54, 55 extend innerly more than the inner periphery of the stationary ring 53.
  • the spacer plates 54, 55 restrict the axial displacement of the planetary rollers 52, 52, ... and act to keep the radial directional agreement between the planetary rollers 52, 52, ... and the stationary ring 53.
  • the one 54 positioned on the side of the electromagnetic clutch 12 extends to the vicinity of the outer periphery of the boss 22a of the armature part 22 and the extended part 54a is utilized as a shielding member for shielding the electromagnetic clutch 12 from the planetary roller reduction unit 17.
  • the spacer plate 54 functioning also as a shielding member, except a small portion required for piercing of the intermediate transmission shaft 15, concretely, piercing of the boss 22.
  • the spacer plate 54 positioned on the side of the transmission shaft 14 extends to the vicinity of the carrier 30 and shields the carrier 30 from the planetary rollers 52, 52, ... except a small space. Hence, leakage of grease from the paths of the planetary rollers 52, 52, ... to the carrier 30 can be prevented. Shortage of grease in the planetary roller reduction unit 17 developing with the lapse of time is prevented and normal transmission performance of the planetary roller reduction unit 17 is assured for a long term.
  • the electromagnetic clutch 12 in this embodiment is somewhat different in structure of the armature part 22 from that shown in Fig. 2.
  • the armature part 22 is constructed in such manner that as disk-like retaining plate 22d is fixedly disposed outside the boss 22a fitted on the intermediate transmission shaft 15 so as to extend roughly in parallel with the spacer plate 54, and a thin movable plate 22b is riveted to the surface of the retaining plate 22d on the side of the retainer 20 at a plurality of points in the circumferential direction as well as a friction plate 22c to this movable plate 22b on the side of the retainer 20.
  • Fig. 5 is a sectional view of the main part of the other modified example of the second embodiment, wherein the same reference numerals are applied to parts corresponding to those in Fig. 3.
  • the labyrinth sealing part in the modified example shown in Fig. 4 is replaced by a contact sealing part.
  • the extended part 54a of the spacer plate 54 and the cylindrical part 55a of the spacer plate 55 are used as core metals of the oil seals, and oil sealing lips 56, 57 for oil seals generally used are directly bonded by baking to cover the extended part 54a and cylindrical part 55a.
  • Oil sealing lips 56, 57 are fixedly stuck to the extended part 54a and cylindrical part 55a and adapted to touch the outer peripheral surface of the boss 22a and that of the carrier 30 for composing the contact sealing part. Because of the spacer plates 54, 55 and oil seals formed integrally with each other, operation to fix these parts is simple and no special space for arrangement of the parts is required.
  • Biasing means for the intermediate transmission shaft 15 is not limited to the wave washer 16 employed in the embodiments and, as a matter of course, may be a coiled spring, spring washer, and others.
  • the intermediate transmission shaft supported at both ends is provided between the output shaft of the steering assisting motor and the transmission shaft connected to the steering mechanism, and the armature part of the electromagnetic clutch is supported by this intermediate transmission shaft.
  • inclination of the armature part can be kept slight and, since the intermediate transmission shaft is pressed to the side of the output shaft by biasing means, the intermediate transmission shaft and armature part supported thereby are correctly positioned with respect to the output shaft, whereby an initial gap roughly uniform in the circumferential direction can easily be provided between the friction plates fixed to the side of the armature part and that of the output shaft and occurrence of troubles in performance resulting from unsatisfactory initial gap can be prevented beforehand.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)

Claims (14)

  1. Dispositif de direction assistée comprenant :
       un moteur (11) installé dans un mécanisme de direction et engendrant une puissance d'assistance de direction ;
       un embrayage électromagnétique (12) prévu entre un arbre de sortie (11a) dudit moteur (11) et un arbre de transmission (14) dudit mécanisme de direction, ledit embrayage accouplant ledit arbre de sortie (11a) audit arbre de transmission (14) et le désaccouplant de ce dernier en fonction de l'action d'une armature (22) de l'embrayage, ledit embrayage (12) comprenant une première plaque de friction (20c) supportée par une pièce de retenue (20) couplée en rotation avec ledit arbre de sortie (11a) et une deuxième plaque de friction (22c) appartenant à l'armature (22) ;
    caractérisé en ce qu'il comprend :
       un arbre de transmission intermédiaire rotatif et axialement mobile (15), coaxial audit arbre de sortie (11a) et audit arbre de transmission (14) et supporté par ces derniers, et supportant la deuxième plaque de friction (22c) de l'embrayage (12) pour rotation commune ; et
       des moyens de rappel (16) pour pousser ledit arbre de transmission intermédiaire (15) dans la direction axiale contre une butée supportée par la pièce de retenue (20).
  2. Dispositif de direction assistée suivant la revendication 1, comprenant en outre :
       un réducteur de vitesse (13) prévu entre ledit arbre de sortie (11a) et ledit arbre de transmission (14) et augmentant le couple de sortie dudit moteur (11).
  3. Dispositif de direction assistée suivant la revendication 2, comprenant en outre :
       un élément de protection (9) pour isoler ledit embrayage électromagnétique (12) dudit réducteur (13).
  4. Dispositif de direction assistée suivant la revendication 2 ou 3, dans lequel ledit réducteur (13) est un réducteur à engrenages planétaires.
  5. Dispositif de direction assistée suivant la revendication 4, dans lequel ledit arbre de transmission intermédiaire (15) est un pignon central (31) dudit réducteur à engrenages planétaires.
  6. Dispositif de direction assistée suivant la revendication 2 ou 3, dans lequel ledit réducteur est un réducteur à rouleaux planétaires (17).
  7. Dispositif de direction assistée suivant la revendication 6, dans lequel ledit arbre de transmission intermédiaire (15) est un rouleau central dudit réducteur à rouleaux planétaires (17).
  8. Dispositif de direction assistée suivant la revendication 6, dans lequel ledit réducteur à rouleaux planétaires comprend :
       un arbre central (51) formé d'une partie centrale de plus grand diamètre dudit arbre de transmission intermédiaire (15) ;
       un anneau fixe (53) bloqué des deux côtés par deux plaques d'espacement (54,55) ;
       une pluralité de rouleaux satellites (52) en contact de roulement avec ledit arbre central (51) et avec le dit anneau fixe (53) ; et
       un élément porteur (30) accouplé par des cannelures audit arbre de transmission (14) ;
       ladite armature comprenant un bossage (22a) qui coulisse dans la direction axiale sur ledit arbre de transmission intermédiaire (15).
  9. Dispositif de direction assistée suivant la revendication 8, dans lequel une (54) desdites deux plaques d'espacement (54,55), qui est du côté dudit arbre de sortie (11a), est prolongée jusqu'au voisinage dudit bossage (22a) et son prolongement (54a) constitue ledit élément de protection.
  10. Dispositif de direction assistée suivant la revendication 9, dans lequel une étanchéité en labyrinthe est formée entre ledit prolongement (54a) et ledit bossage (22a).
  11. Dispositif de direction assistée suivant la revendication 9, comprenant en outre :
       une lèvre d'étanchéité à l'huile (56) fixée au dit prolongement (54a).
  12. Dispositif de direction assistée suivant la revendication 11, dans lequel ladite lèvre d'étanchéité à l'huile (56) est en contact avec la périphérie extérieure dudit bossage (22a) de manière à constituer une étanchéité par contact.
  13. Dispositif de direction assistée suivant la revendication 8, dans lequel une (55) desdites deux plaques d'espacement (54,55) , qui est du côté dudit arbre de transmission (14), est prolongée jusqu'au voisinage du dit élément porteur (30).
  14. Dispositif de direction assistée suivant la revendication 1, dans lequel lesdits moyens de rappel (16) sont une rondelle ondulée.
EP90114746A 1989-08-04 1990-08-01 Direction assistée Expired - Lifetime EP0411600B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP20324089 1989-08-04
JP203240/89 1989-08-04
JP134220/89U 1989-11-17
JP1989134220U JPH0716134Y2 (ja) 1989-11-17 1989-11-17 遊星ローラ式動力伝達装置
JP7798690A JP2816408B2 (ja) 1989-08-04 1990-03-26 動力舵取装置
JP77986/90 1990-03-26

Publications (2)

Publication Number Publication Date
EP0411600A1 EP0411600A1 (fr) 1991-02-06
EP0411600B1 true EP0411600B1 (fr) 1995-01-18

Family

ID=27302578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90114746A Expired - Lifetime EP0411600B1 (fr) 1989-08-04 1990-08-01 Direction assistée

Country Status (4)

Country Link
US (1) US5145021A (fr)
EP (1) EP0411600B1 (fr)
KR (1) KR940002082B1 (fr)
DE (1) DE69016120T2 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2670735B1 (fr) * 1990-12-19 1995-06-23 Cartier Systemes Mecanisme d'assistance temporaire pour colonne de direction de vehicules a roues directrices.
DE69416968T2 (de) * 1993-12-27 1999-09-30 Nsk Ltd Servolenkung
JP3301303B2 (ja) * 1995-10-13 2002-07-15 トヨタ自動車株式会社 電動機
US6026924A (en) * 1997-02-10 2000-02-22 Trw Inc. Steering gear
JPH11139326A (ja) * 1997-11-10 1999-05-25 Koyo Seiko Co Ltd 電動パワーステアリング装置
WO2000009382A1 (fr) * 1998-08-15 2000-02-24 Krupp Presta Ag Direction assistee par moteur electrique, dotee d'un engrenage planetaire compact
DE19849326A1 (de) * 1998-10-26 2000-04-27 Zahnradfabrik Friedrichshafen Elektrisch unterstützte Hilfskraftlenkung für Kraftfahrzeuge
US6257364B1 (en) 2000-01-20 2001-07-10 Ford Global Technologies, Inc. Submersible electro-hydraulic powerpack for underhood automotive steering applications
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Also Published As

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US5145021A (en) 1992-09-08
KR940002082B1 (ko) 1994-03-17
KR910004415A (ko) 1991-03-28
DE69016120T2 (de) 1995-06-22
DE69016120D1 (de) 1995-03-02
EP0411600A1 (fr) 1991-02-06

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